Dentist&#39;s mixing plate



Agril 18, 1933. c, J. McCANN 1,904,766

DENTISTS MIXING PLATE Filed Dec. 26, 1930 F/QZ n r Y INVENTOR. CHARL E5 J. M: CAN/V ATTORNEY3.

Patented Apr. 18 1933 J UNITED STATES PATENTOFFICE' f}? 7 CHARLES J. MCGA'NN, F BAY CITY, MICHIGAN DENTISTS MIXING PLATE Application filed December 26, 1930. Serial No. 504,725.

40 affords such material.

body of the mixing plate is a thermometer 2 consisting of a stem 3 provided with suitable 'of making this disclosure, mixing plates as used by dentists will be referred to.

Such mixing'plates may consist of a block of material, such as glass, upon which the enamel is mixed and worked in preparationforits utilization in teeth. I It is advantageous that such mixing plates be maintained at a temperature requisite for obtaining the desired results in the enamel. the plate must be in a heated condition during the time the enamel is being mixed and worked thereon in order that no ill effects result in the finished enamel article. Accord ingly this invention contemplates a mixing plate embodying a heat indicating unit so that the temperature of the mixing plate may 1 b dd d d th t d d t em e e an 1s is in en e 0 cover at once be accurately determined. The plate should be from 25 to .70 degrees Fahrenheit for best results in some enamel work.

In the accompanying drawing:

Fig. 1 is a perspective view of a mixing plate embodying the temperature indicator as contemplated by the present invention.

Fig. 2 is a sectional view taken through the As shown in the drawing herein the mixing plate in Fig.1 consists of a plate or block 1 which may be formed of two pieces of transluscent or transparent material. Glass Embedded in the indicia 4, and, with the usual bulb 5 containing the-expansible and contractable substance; As shown in Fig. 1-, the thermometer is positioned substantially centrally of the mixing plate, but it is within the invention to dispose it in any advantageous position. The thermometer itself is of lass, and thus the coefficient of expansion o? both thermometer In other words,

mometer and indicia thereon are readily visi- 5 ble. Accordingly the temperature ,of the plate may be determined with a nicety;

The plate may be made up in two sec: tions, one section being shown at .10 and an-, other 11, and these formed withrecesseso' which cooperate when the plates are placed together to form a cavity in which a thermom eter 2 may be disposed. In a plate'of this kindthe two parts may be sealed, as, at 12, around their edges so as to substantially form one integral structure.

Such a. mixing plateiconstructed in ac cordance with thisinvention embodying in its 'make-up a temperature-indicating -de- 7 vice which is readily visible, is capable of having its temperature accurately deter-1 mined with the result that the enamel or other substance mixed or worked thereon comes out properly in the finished work. i

In the description use is made of the term' the construction where the thermometer is disposed in a preformed cavity.

I claim:

A dental mixing platecomprising aibody 30 i I of glass having one side substantially plane with a depression therein, another body of glass similar to the first and having one side substantially plane with a depressiontherein similar to that of the first, saidglass 5 bodies being placed together with said plane sides against each other and with the sur-= faces of the said sides substantially coplanar I and with the depressions "cooperating to p 1 mometer disposed in said space and' -substantially fitting the same, and said glass" bodies being sealed together around' theiredges. V 1 In testimony whereof I aflEix my signature.

, CHARLES McOANN. 9 

